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A. SCHNEIDER.

LATHE GEARING.

APPuc/mou man oms. ma.

Patented Aug. 26, 1919.

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Patented Aug. 26, 1919.

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AIVIN SCHNEIDER, OF LENZBURG, SWITZERLAND.

LATHE- GEABING.

Specication of Letters Patent.

Patented Aug. 26, 1919.

Application filed December 8, 1916. Serial No. 135,767.

To all 'whom it may concern Be it known that 1, ALWIN ScI-mnmnn,engineer, citizen of Switzerland, residing at Lenzburg, in the CantonAargau, Switzerland, have invented certain new and useful Improvementsin Lathe-Gearings, of which the following is a specification.

Fig. 1 is a front view showing some parts in section.

Figs. 2 to 4 are views of some details.

Fig. 5 is an elevational view of the gearing and of adjacent partgvofthe lathe.

Fig. 6 is an end elevation looking toward the right hand end of Fig. 5;and

Fig. 7 is a section .on the line A-B of Fig. 5.

This invention relates to a new and useful improvement in gearings onlathes, enabling threads of various kinds to be cut without change gearwheels.

With this object in view the invention consists in the construction,arrangement, and combination of the several parts, all as willhereinafter be described, and afterward pointed out in the claim.

In the drawings some of the parts are shown in schematic design and theproportions in size are changed in order to make the drawings morecomprehensible.

To the spindle S (partly shown only) of the lathe the gear wheel 33 iskeyed and has 33 teeth. For simplicity and clearness sake allV gearwheels are designated by numbers giving at the same time the number ofteeth. Facing the gear wheel 33 there is on shaft a the gear wheel 7 8which can be connected by means of the reversing gear /w (Fig. 2,omitted in Fig. 1) to gear wheel 33 in such a way that the latter runseither ahead or astern. The shaft a carries two loose gear wheels 24 and36 which can be coupled with shaft a by means of the flanged coupling Aarranged between the two wheels. The gear wheel 24 is geared with gearwheel 48 and the gear wheel 36 with gear wheel 36a. The gear wheels 48and 36a are keyed to shaft b which carries two loose gear wheels 50 and80. The latter can be coupled with shaft b by means of the flangedcoupling B ar-l ranged between them. The gear wheel 8O is geared withgear wheel 2O and the gear wheel 50 with gear wheel 50, the gear wheels20 and 50EL are keyed t0 shaft c which carries besides gear wheel 39keyed to this shaft too and geared with gear wheel 88 on shaft d towhich a set of cone gears 20, 25, 30, 35, 40, 45, 50, 55 is keyed. Thegear wheel 20 can be coupled with these by means of the Norton tumblergear n the swinging gear wheel of which is geared with gear wheel 20, asshown in Fig. 3. In this figure the uncoupled position of the Nortontumbler gear is shown by the dotted lines. The gear wheel 20 is keyed toshaft e carrying the sliding gear wheel 30 which can be made to followthe shaft and is geared with the swinging gear of the second Nortontumbler gear N (Fig. 4, omitted in Fig. l). By the latter the gear wheel30 can be coupled with any wheel of the cone gear 20-55 or with anywheel of the second set of cone gears 96, 88, 80, 76, 72, 64, 56, 48,40, 32. This second cone gear is keyed to shaft f to which gear wheel85l is also keyed, which is geared with gear wheel 85 fitted loose tothe lead screw L. Besides, the latter carries the loose gear wheel 31geared with gear wheel 31a which is keyed to shaft e. Between the gearwheels 31 and 85 the flanged coupling C is provided so as to be able tocouple them with the lead screw L which is 8 mm. pitch, threads perinch.

The gearing above described allows threads of various kinds to be cut byadjusting in different ways the three couplings A, B, C and the twoNorton tumbler gears n and N, eliminating thereby the removal andadjustment of change gear wheels. For the use of the gearing an index ismade as shown by theexample part of which follows hereafter.

The igures mentioned in the first line of this index have the followinmeaning: for instance, a screw with 48 t reads per inch in Whitworthpitch is to be cut, then the coupling A must be adjusted to gear Wheel24, the coupling B to gear wheel 50 and the cou pling C to gear wheel85; the Norton tumbler gear n must be connected to gear wheel that means3.175

t to 8.85 mm. per

kalternately with the 30, the Norton tumbler gear N to the gear wheel 60of the upper set of cone gears. Thus the following equation is,obtainedz lmust be disengaged and the Norton tumbler to gear wheel 55of the gear N connected Thus the following lower set of cone gears.equation 1s obtained :y

es, edgy, 55,31a ii v 78 36a 2O 88 30 31* 8 By changing the wheels thisgearing enables 45 various standard threads in both systems to be cut,that is to say: 45 regular and 45 square threads from 0.5 to 48 per inchin Whitworth system and 45 regular and 45 square threads from 0.5 to 52mm. pitch in metric system. To obtain this result, the wheels 24, 48 and36, 36a on shafts i and are substituted by the following wheels: .onshaft a by three wheels with 60, 80 and 96 teeth which have to becoupled shaft, on shaft t by three wheels with 60, 40 and 24 teeth whichare geared in corresponding succession with the former wheels. Thewheels 50 and 80 onv shaft kZ) are substituted by two wheels with 35 and84 teeth and the wheels 50a and 20 on shaft c by two wheels with 70 and2l teeth which are geared with the former wheels. The wheel 2l can becoupled with wheel 2Oa on shaft e by means of the Norton tumbler gear n.The set of cone gears on shaftd is provided with two additional wheelswith 60 and 65 teeth; in all otherv respects thegearing remains as itis. The various possibilities of gearing can be seen from specialindexes. The metric cone gives also 45 feeds of 0.065 to 6.5 mm. errevolutionfor sliding and 45 feeds of 0.065 revolution for surfacing.y

Copies of this patentmay be obtained forve cents each, by addressing thefourth intermediate shaft graduated gear wheels mounted on the lat-yWorms with one or several threads can also be cutv on this gearing.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is`

In lathe gearing, the combination of a driving shaft and a firstintermediate shaft, means for impartinrf the rotary motion of thedriving shaft to said first intermediate shaft, a pair of gear wheelsmounted loosely on said first intermediate shaft, means for selectivelycoupling either of said gear wheels to its shaft, a second intermediateshaft adapted to be driven from said first intermediate shaft by meansof the gear wheels thereon, a pair of gear wheels mounted loosely onsaid second intermediate shaft, means for selectively coupling eitherlof said last mentioned gear wheels to its shaft, a third intermediateshaft adapted to be driven from said second intermediate shaft by thegeary wheels on the latter, a and a series of ter, gearingadapted toconnect said third and fourth intermediate shafts to each other, acounter shaft and a lead screw, gearing adapted to connect said countershaft to said lead screw,` a Norton tumbler gear adapted lto connectsaid third intermediate shaft to said counter shaft, a second countershaft and a series of graduated gearwheels carried thereby, gearingadapted to connect said second counter shaft with said lead screw, and asecond Norton tumbler gear adapted to connect said first counter shaftwith said second counter shaft, whereby when said rst mentioned Nortongear is in inoperative position said second mentioned Norton gear will-connect the first counter shaft with the first gear on thefourthintermediate shaft. A

In testimony whereof I have affixed my signature, in presence of twowitnesses.

ALWIN SCHNEIDER. Witnesses A. R. ABRINSKY, CARL GUBLER.

Commissioner of Patents,

